Fig. 1
From: The genetic basis of a social polymorphism in halictid bees
The socially polymorphic halictid bee L. albipes. Populations in western France are eusocial (blue and green colors), while populations in the east are solitary (red and orange colors). Eusocial females produce two broods: first workers, then reproductives, while solitary females produce a single, reproductive brood. This variation is strongly correlated with season length and mean temperature, with eusocial populations in regions with longer seasons and a warmer mean temperature than solitary populations3. Drawings by W. Tong
